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J. Phys. Soc. Jpn. 77 (2008) 083704 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln = La, Nd)

Chul-Ho Lee, Akira Iyo, Hiroshi Eisaki, Hijiri Kito, Maria Teresa Fernandez-Diaz1, Toshimitsu Ito, Kunihiro Kihou, Hirofumi Matsuhata, Markus Braden2, and Kazuyoshi Yamada3

National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568
1Institut Laue-Langevin, BP 156, F-38042 Grenoble Cedex 9, France
2II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
3Institute for Materials Research, Tohoku University, Sendai 980-8577

(Received June 18, 2008; Accepted June 23, 2008; Published August 11, 2008)

The crystal structure of LnFeAsO1-y (Ln = La, Nd) has been studied by the powder neutron diffraction technique. The superconducting phase diagram of NdFeAsO1-y is established as a function of oxygen content which is determined by Rietveld refinement. The small As–Fe bond length suggests that As and Fe atoms are connected covalently. FeAs4-tetrahedrons transform toward a regular shape with increasing oxygen deficiency. Superconducting transition temperatures seem to attain maximum values for regular FeAs4-tetrahedrons. ©2008 The Physical Society of Japan

KEYWORDS: oxypnictides, superconductivity, powder neutron diffraction, crystal structure analysis
URL: http://jpsj.ipap.jp/link?JPSJ/77/083704/
DOI: 10.1143/JPSJ.77.083704


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